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Diffstat (limited to 'python/pyspark/java_gateway.py')
| -rw-r--r-- | python/pyspark/java_gateway.py | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/python/pyspark/java_gateway.py b/python/pyspark/java_gateway.py index 6f4f62f23b..9c70fa5c16 100644 --- a/python/pyspark/java_gateway.py +++ b/python/pyspark/java_gateway.py @@ -15,6 +15,7 @@ # limitations under the License. # +import atexit import os import sys import signal @@ -69,6 +70,22 @@ def launch_gateway(): error_msg += "--------------------------------------------------------------\n" raise Exception(error_msg) + # In Windows, ensure the Java child processes do not linger after Python has exited. + # In UNIX-based systems, the child process can kill itself on broken pipe (i.e. when + # the parent process' stdin sends an EOF). In Windows, however, this is not possible + # because java.lang.Process reads directly from the parent process' stdin, contending + # with any opportunity to read an EOF from the parent. Note that this is only best + # effort and will not take effect if the python process is violently terminated. + if on_windows: + # In Windows, the child process here is "spark-submit.cmd", not the JVM itself + # (because the UNIX "exec" command is not available). This means we cannot simply + # call proc.kill(), which kills only the "spark-submit.cmd" process but not the + # JVMs. Instead, we use "taskkill" with the tree-kill option "/t" to terminate all + # child processes in the tree (http://technet.microsoft.com/en-us/library/bb491009.aspx) + def killChild(): + Popen(["cmd", "/c", "taskkill", "/f", "/t", "/pid", str(proc.pid)]) + atexit.register(killChild) + # Create a thread to echo output from the GatewayServer, which is required # for Java log output to show up: class EchoOutputThread(Thread): |